Update: The FAA tells CBS News the computer outage has forced a halt to departures at airports in Las Vegas, Phoenix, Salt Lake City and at other airports in the region as well.
The FAA says computer issues are forcing a ground stop at Los Angeles International Airport.
Airport spokeswoman Nancy Castles said Wednesday afternoon that the Federal Aviation Administration had put a "ground stop" on departures. Arrivals were still being accepted.
Castles wasn't sure what caused the problem. An FAA spokesman did not immediately respond to a request for comment.
Los Angeles International is the nation's third-busiest airport.
The airport's website is reporting departure delays of 45 minutes to an hour.
-- The Associated Press contributed to this report.